MATH DICTIONARY


U

union:  the union of two sets, A and B, is the set of all elements that are either in A, or in

            B, or in both A and B.

unit vector:  a vector of length 1.   It is customary to designate i as the unit vector in the x


V

variable:  a symbol used to represent a value.

vector:  a quantity that has both magnitude and direction.

velocity:   the rate of change of position.    The first derivative of the position function.

vertex:  the point on an angle where the two sides intersect.

volume:  measurement of space.


W

whole numbers:  the set of numbers that includes zero and all of the natural numbers.


X

x-axis:  the horizontal axis in a Cartesian Coordinate System.

x-intercept:   the value of x at the point where a curve crosses the x-axis.


Y

y-axis:   the vertical axis in a Cartesian Coordinate System.

y-intercept:   the value of y at the point where a curve crosses the y-axis.


Z


zero:   the additive identity.   The number that when you add it to a number, n, you will get

n as a result.                                                                                                          

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